Use table prefix when using orderByRelevance (#68)

Author: tushargugnani

src/Searcher.php

@@ -509,8 +509,9 @@ private function addRelevanceQueryToBuilder($builder, $modelToSearchThrough)
             throw OrderByRelevanceException::new();
         }
 
-        $expressionsAndBindings = $modelToSearchThrough->getQualifiedColumns()->flatMap(function ($field) {
-            $field = (new MySqlGrammar)->wrap($field);
+        $expressionsAndBindings = $modelToSearchThrough->getQualifiedColumns()->flatMap(function ($field) use ($modelToSearchThrough) {
+            $prefix = $modelToSearchThrough->getModel()->getConnection()->getTablePrefix();
+            $field = (new MySqlGrammar)->wrap($prefix . $field);
 
             return $this->termsWithoutWildcards->map(function ($term) use ($field) {
                 return [